The pom.xml file

The pom.xml file, which is a standard Maven project model file, defines things such as the JDBC URL we need so that we can connect to the database we wish to work with as well as the version of the Liquibase plugin.

An H2 database file, /tmp/liquidhello.h2.db, will be created. H2 is a convenient in-memory database suitable for testing.

This is the pom.xml file for the "liquibase hello world" example:

<?xml version="1.0" encoding="utf-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>se.verona.liquibasehello</groupId>
  <artifactId>liquibasehello</artifactId>
  <version>1.0-SNAPSHOT</version>
  <build>
    <plugins>
      <plugin>
        <groupId>org.liquibase</groupId>
        <artifactId>liquibase-maven-plugin</artifactId>
        <version>3.0.0-rc1</version>
        <configuration>
          <changeLogFile>src/main/resources/db-changelog.xml
          </changeLogFile>
          <driver>org.h2.Driver</driver>
          <url>jdbc:h2:liquidhello</url>
        </configuration>
        <dependencies>
          <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <version>1.3.171</version>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>

If you run the code and everything works correctly, the result will be an H2 database file. H2 has a simple web interface, where you can verify that the database structure is indeed what you expect.